Factor the Binomial Completely $s ^ { 2 } b ^ { 2 } - 1$

Factor the binomial completely.
- $s ^ { 2 } b ^ { 2 } - 1$

A) $( s b + 1 ) ( s b - 1 )$
B) $( s b - 1 ) ^ { 2 }$
C) $( s b + 1 ) ^ { 2 }$
D) prime